Metabolic Engineering for Overproduction of Colanic Acid in Escherichia coli Mutant with Short Lipopolysaccharide

被引：15
作者：
Zhan, Yi [1 ,2 ,3 ]
Qiao, Jun [1 ,2 ,3 ]
Chen, Shanshan [1 ,2 ,3 ]
Dong, Xiaofei [1 ,2 ,3 ]
Wu, Yuanming [1 ,2 ,3 ]
Wang, Zhen [1 ,2 ,3 ]
Wang, Xiaoyuan [1 ,2 ,3 ]
机构：
[1] Jiangnan Univ, State Key Lab Food Sci & Technol, Wuxi 214122, Peoples R China
[2] Jiangnan Univ, Sch Biotechnol, Key Lab Ind Biotechnol, Minist Educ, Wuxi 214122, Peoples R China
[3] Jiangnan Univ, Sch Biotechnol, Int Joint Lab Food Safety, Minist Educ, Wuxi 214122, Peoples R China
来源：
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2022年 / 70卷 / 27期
关键词：
Escherichia coli; colanic acid; metabolic engineering; acetate; acetyl-phosphate; undecaprenyl phosphate; O-antigen; enterobacterial common antigen; MORPHOLOGICAL DEFECTS; IDENTIFICATION; BIOSYNTHESIS; ACETYLATION; MUTAGENESIS; ANTIGEN; GENOME; GROWTH; COMMON; GENE;
D O I：
10.1021/acs.jafc.2c03053
中图分类号：
S [农业科学];
学科分类号：
09 ;
摘要：
ABSTRACT: Colanic acid is a major exopolysaccharide existing in most Enterobacteriaceae when exposed to an extreme environment. Colanic acid possesses excellent physical properties and biological activities, which makes it a candidate in the food and healthcare market. Previous strategies for colanic acid overproduction in E. coli mainly focus on removing the negative regulator on colanic acid biosynthesis or overexpressing the rcsA gene to up-regulate the cps operon. In this study, modifications in metabolic pathways were implemented in E. coli mutant strains with shortened lipopolysaccharides to improve colanic acid production. First, ackA was deleted to remove the byproduct acetate and the effect of accumulated acetyl-phosphate on colanic acid production was investigated. Second, 11 genes responsible for O-antigen synthesis were deleted to reduce its competition for glucose-1-phosphate and UDP-galactose with colanic acid production. Third, uppS was overexpressed to supply lipid carriers for synthesizing a colanic acid repeat unit. Colanic acid production in the final engineered strain WZM008/pTrcS reached 11.68 g/L in a 2.0 L bioreactor, 3.54 times the colanic acid production by the WQM001 strain. The results provide insights for further engineering E. coli to maximize CA production.
引用
收藏
页码：8351 / 8364
页数：14
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